Classifications

• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
  • H02M5/00—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases
  • H02M5/02—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into DC
  • H02M5/04—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into DC by static converters
  • H02M5/22—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into DC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
  • H02M5/275—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into DC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
  • H02M5/293—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into DC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
  • H02M5/00—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases
  • H02M5/02—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into DC
  • H02M5/04—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into DC by static converters
  • H02M5/22—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into DC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
  • H02M5/275—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into DC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
  • H02M5/297—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into DC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal for conversion of frequency

Definitions

• the present invention relates to a high voltage AC direct power conversion device (matrix converter, AC-AC direct power conversion circuit), and more particularly to a high voltage AC direct power conversion device for obtaining a high voltage output by series multistage connection of AC direct conversion circuits. .
• FIG. 3 shows an example of the main circuit configuration of a conventional high voltage inverter, which directly drives a 3300 V, 6600 V high voltage motor with a multilevel PWM waveform (see, for example, Non-Patent Document 1).
• Multiple winding transformer TF provides nine winding on the secondary side to obtain the output stepped down to each secondary winding.
• the single-phase inverter units U1 to U3, V1 to V3 and W1 to W3 rectify the three-phase output of the secondary winding of the transformer TF with a rectifier, as representatively shown for the single-phase inverter unit W1 Using this as a DC power supply, a single-phase AC output is obtained in a single-phase inverter circuit.
• the outputs of single-phase inverter units U1 to U3, V1 to V3 and W1 to W3 are connected in multiple stages in series for U, V, and W phases to obtain single-phase high-voltage outputs for each phase. It connects to each other as the neutral point N, and drives the load such as the high-pressure motor M with the three-phase high-voltage output obtained at the other end.
• Each unit is a basic unit that constitutes a conversion circuit.
• each single-phase inverter unit performs AC-DC conversion by a rectifier, so that regenerative power from the load can not be regenerated to the power supply side (transformer TF side).
• a separate power regeneration converter is required to enable this power regeneration.
• a high-pressure matrix converter in which single-phase matrix converters are connected in multiple stages to obtain a high-pressure output (see, for example, Patent Document 1 and Non-patent Document 2).
• single-phase matrix converter unit MxC is arranged in place of single-phase inverter units U1 to U3, V1 to V3, and W1 to W3 in FIG.
• Single-phase matrix converter unit MxC obtains single-phase alternating current directly from three-phase alternating current, with bidirectional switches S1 to S6 between three-phase input and single-phase output and an input filter ACFilter (input LC filter).
• Configured and bi-directional switch PWM By controlling, a single-phase output with an arbitrary frequency and voltage can be supplied to the load, and power can be regenerated to the power supply side when the load is regenerated.
• the multiple winding transformer TF has a phase difference in each secondary winding in order to reduce the power supply side harmonic current.
• Non-Patent Document 1 A document published in Japan, "Multiple PWM control method for direct drive of high voltage motor considering the influence of dead time, Journal of the Institute of Electrical Engineers of Japan, Journal of Electrical Society of Japan, D, 126 ⁇ 1, p. 1-9 (20
• Patent Document 1 Japanese Patent Laid-Open No. 2005-45999, which is a published patent document of Japan.
• Non-Patent Document 2 “Motor Drive with High-Pressure Matrix Converter, Material of the Institute of Electrical Engineers of Japan Institute of Metals Industry, MID _ 05 _ 24 (2005)”, which is a document published in Japan.
• a conventional high voltage inverter or high voltage matrix converter is a single-phase inverter unit (see FIG.
• a single-phase matrix converter unit (Fig. 4) is connected in series in multiple stages, and the power supply side of each unit is configured to extract AC power from the individual secondary winding of the transformer.
• the power supply side of each unit is configured to extract AC power from the individual secondary winding of the transformer.
• at least nine units are required, and nine secondary side transformers (27 secondary windings) are required, resulting in an increase in size and complexity of the device configuration.
• An object of the present invention is to provide a high voltage AC direct power converter which can simplify the main circuit configuration including a transformer and an LC filter.
• the present invention for solving the above-mentioned problems is characterized by the following constitution.
• Multiple-winding transformer power provided with a plurality of secondary windings: AC direct conversion circuit which directly converts input voltage and frequency into desired voltage and frequency, and outputs it
• An LC filter is provided between the secondary winding and the ac direct conversion circuit, and the ac direct conversion circuits are connected in multiple stages, and the load is directly controlled at a high voltage by controlling the bidirectional switch of each ac direct conversion circuit.
• One of the AC direct conversion circuits of the lowest voltage stage interconnects each phase end of the non-power supply side, and one of the AC direct conversion circuits of the highest voltage stage connects the opposite power supply side to a load, the lowest voltage stage and the highest
• the respective stages located between the voltage stages mutually connect the non-power supply side of one of the AC direct conversion circuits to the other power supply side of one of the previous AC direct conversion circuits, and the other of the AC direct conversion circuits.
• a feature is characterized in that the non-power supply side is interconnected to the non-power supply side of one of the AC direct conversion circuits in the next stage.
• the AC direct conversion circuit is characterized in that it is a polyphase input polyphase output.
• the secondary windings of the multiple winding transformer are characterized in that they have a phase difference with each other to suppress input harmonics.
• Each of the AC direct conversion circuits is characterized as a single input sinusoidal wave, and each secondary winding of the multiple winding transformer has the same phase to suppress input harmonics.
• the AC direct conversion circuit of the two parallel connections is a basic unit configuration, and the control device is shared in the basic unit.
• the main circuit configuration can be simplified in the high voltage AC direct power converter, including the transformer and the LC filter.
• a versatile multiphase input / multiphase output matrix-connected semiconductor switching device module can be used.
• the number of switching devices can be the same as in the conventional method.
• the number of secondary windings of the multiple winding transformer can be reduced as compared with the conventional method.
• the wiring between the parallel units and the control device can be made common, and the reduction of the wiring inductance and the sharing of the control device can be realized.
• FIG. 1 is a main circuit configuration diagram of a high voltage AC direct power conversion device showing an embodiment of the present invention, and an example using a three-phase AC direct power conversion circuit is shown in FIG. I will explain based on it.
• the multi-wire transformer TF is configured to have three secondary windings with phase difference, and each secondary winding passes through an LC filter, respectively, and AC direct conversion circuits MC1A and MCIB, MC2A connected in parallel. And MC2B, connected to the power supply side of MC3A and MC3B.
• the LC filter suppresses harmonics to input / output current between the AC direct conversion circuit and the AC power supply.
• the AC direct conversion circuits in two parallel connection MC1A and MCIB, MC2A and MC2B, MC3A and MC 3B have a three-phase one-three-phase AC direct conversion circuit configuration as typified by MC1A.
• 2 converter circuits connected in parallel MC1A and MCIB are the lowest voltage stages, and the three phase terminals on the power supply side are connected in parallel in the same phase, and the three phase ends on the non-power supply side of one MC1A are interconnected.
• a two-circuit series connection configuration in which the three-phase terminal on the non-power supply side of the other MC1B is interconnected in series with the three-phase terminal on the non-power supply side of the next MC2A is used.
• two parallel connected conversion circuits MC2A and MC2B located between the lowest voltage stage and the highest voltage stage, and MC3A and MC3B to become the highest voltage stage are respectively configured in a two-circuit series connection configuration, one conversion In circuits MC2A and MC3A, the three-phase terminal on the non-power supply side is connected in series with the three-phase terminal on the non-power supply side of the previous stage MC1B and MC2B, and the three-phase terminal on the non-power supply side of conversion circuit MC3B is connected to Load.
• a force to give a phase difference to the secondary side of the multi-wire transformer to suppress input harmonics Features of the above (6) ⁇ If an advantage is used, a phase difference is given to the secondary side Input sine wave can be made for each 3-phase / 3-phase direct current conversion circuit without it.
• input harmonics can be suppressed by providing a secondary winding having the same phase that provides a phase difference on the secondary side of the multiple winding transformer.
• the secondary side design of the multiple winding transformer is simplified, and the structure 'cost' size of the multiple winding transformer is a further advantage.
• three-phase / three-phase AC direct power conversion circuits MC1A, MCIB, MC2A, MC2B, MC3A, and MC3B are not individually configured as a single unit in a basic unit (cellification) configuration, but The control circuits are shared in common, with the control CPUs as the basic unit configuration (the dotted block configuration in Figure 1), with the parallel connected conversion circuits MC1A and MCIB, MC2A and MC2B, and MC3A and MC3B.
• the wiring between the conversion circuit units and the control device can be made common, and the reduction of the wiring inductance and the sharing of the control device can be realized.
• FIG. 1 is a configuration diagram of a main circuit of a high voltage AC direct power conversion device according to a first embodiment of the present invention.
• FIG. 2 A main circuit configuration diagram of a high voltage AC direct power conversion device showing Embodiment 2 of the present invention.
• FIG. 3 shows an example of the main circuit configuration of a conventional high voltage inverter.
• FIG. 4 is a main circuit configuration diagram of a conventional high voltage matrix converter.

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• Engineering & Computer Science (AREA)
• Power Engineering (AREA)
• Ac-Ac Conversion (AREA)

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• 2006
  • 2006-05-24 JP JP2006143563A patent/JP4793096B2/ja not_active Expired - Fee Related
• 2007
  • 2007-05-18 EP EP07743621.0A patent/EP2051361A4/en not_active Withdrawn
  • 2007-05-18 CN CNA2007800189702A patent/CN101461123A/zh active Pending
  • 2007-05-18 RU RU2008143459/09A patent/RU2379817C1/ru not_active IP Right Cessation
  • 2007-05-18 WO PCT/JP2007/060186 patent/WO2007135968A1/ja active Application Filing

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Non-Patent Citations (5)

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